Extra thick aircraft-grade aluminum maximizes durability and maintains accurate square. Black finish is treated to resist corrosion. Embossed graduations are painted yellow for readability in all light conditions. Markings include brace measures, octagon scale, board measures and rafter table. Graduation (back) 1/16 in, 1/10 in, 1/12 in, (face) 1/16 in, 1/8 in.
